Types of Waves

There are 2 types of waves:

transverse
(e.g. tidal wave, stadium wave, eletromagnetic waves)
longitudinal waves
(e.g. sound wave, earthquake)

Transverse Waves

particles of the medium move in a direction perpendicular to the direction of the wave movement (or the energy movement).

Longitudinal Waves

particles of the medium move in a direction perpendicular to the direction of the wave movement (or the energy movement).